This happens with girls too. There was locker room talk starting in middle school. I realized later most of what I was hearing was a lie.
Carry that forward to logical conclusion. If most of the girls are lying about their sexual experiences then either ALL the boys are banging the same few girls or they’re lying a lot too. Observing who they’ve been spending all their time with will lead you toward the conclusion that there’s a lot of lying going on by both boys and girls.
And that makes sense, because sex was made taboo.
I squashed a few rumors about some boy having had sex with me a few times myself. I wasn’t even allowed to date until I was 16. The rumors stopped when I loudly and very publicly emasculated a boy for lying about it. Luckily, I stumbled into a moment of brilliance.
Before everybody reading comments comes at me for being too hard on the poor boy and having no empathy or whatever, let’s keep in mind that girls get hurt when boys lie to give themselves a false reputation.
*It destroys the girl’s reputation, which depends upon modesty rather than conquest.
*If the lie goes beyond the school, which it will, she could face parental abuse. It happens.
*She loses friends.
*There could be censure from religious organizations she and her family may belong to.
*Other boys will target her for harassment and assault because she’s "an easy lay”.
Coming back around to the point, guys shouldn’t get too hung up on having missed out on any action on high school. Chances are, most of that action they think everyone else had back in high school was either wildly conflated or a flat out lie.
Men lie. They lie all the damn time to women to trick them into sex. Men applaud each other for this all the damn time. Yet they all seem to think all this locker room talk is straight truth. Bro code or something. It makes no sense.